Company email (April 2013):
"All but one of our beers use isinglass finings. Quadrant Oatmeal Stout is vegan friendly, though, as it not fined.

No other animal products are used."

Company email (October 2012):
"I'm afraid we do use isinglass to fine our beer in cask - sorry (I have tried without, but it just would not clear, and I'm afraid the majority of pub customers still want clear beer). We have one beer that we do not fine, Quadrant Oatmeal Stout, but we've only made it once so far and I'm not sure when it'll be made again.

Our bottled beers will be vegan friendly, though, as they will not be fined.